A double-cylinder dosing device at the wellhead of an oil pump

Abstract

The invention discloses a double-cylinder drug-adding device for an oil wellhead, comprising a pump cylinder. The pump cylinders are two in number and are symmetrically arranged on the left and right. A guide sleeve is fixedly connected to the top of the pump cylinder. A lower connecting plate is arranged above the guide sleeve. The lower connecting plate is provided with an opening at the guide sleeve. A guide column is inside the guide sleeve. The guide column passes through the opening on the lower connecting plate and is fixedly connected to an upper connecting plate on the top. A stud block is arranged above the inside of the guide column. The stud block is threadedly connected to the guide column. A stud scale is fixedly connected above the stud block. A plunger is arranged below the inside of the guide column. The invention discloses a continuous drug-adding device. The drug-adding device is mounted on the upper end of a packing box. By mounting pump cylinders, guide columns, buffer springs and other parts on both sides of the device, drug liquid is sucked into the pump cylinder by the upward force of a light rod, and the drug liquid is pressed out of the pump cylinder by the downward force of the light rod and discharged through a single-flow valve. The drug-adding amount can be accurately measured and adjusted by the stud scale, so that continuous drug-adding can be achieved. Two drugs are added by accurate measurement to prevent waxing and viscosity reduction in the oil well.

Description

Technical Field

[0001] The invention belongs to the technical field of oil extraction, and in particular relates to a double-cylinder dosing device at a wellhead of an oil pump. Background Art

[0002] The water content of oil wells in major oil fields in my country is generally high, and high water content brings about problems such as scaling and corrosion of downhole pipes and rods. In addition, due to the difficulty in exploiting reserves, some oil wells have abnormal production due to reasons such as thick oil and wax deposition, resulting in high wellhead back pressure, which affects the normal production and development of the oil fields; its prevention and control measures mainly include adding wax removers, lubricants and scale inhibitors to the oil well casing. Abnormal production wells require the addition of more than two agents to achieve the purpose of corrosion inhibition, wax prevention and viscosity reduction. The traditional method of adding drugs is the direct dosing method in the artificial annulus, that is, adding corresponding chemical agents to the oil well annulus manually and by dosing vehicles. This method is not only time-consuming and labor-intensive, but also the release of oil well casing gas during operation can easily cause the drug liquid to splash, causing personal injury and environmental pollution. The use of a vehicle to add chemicals has the problem of untimely addition of chemicals, which results in high labor intensity for both the operator and the vehicle. The current dosing processes all have the problem of inaccurate addition of chemicals and difficult operation. Even through a metering pump, only one chemical can be added, and there are potential safety hazards of environmental pollution. Therefore, we propose a double-cylinder dosing device at the wellhead of an oil pump. Summary of the invention

[0003] The purpose of the present invention is to provide a double-cylinder dosing device at the wellhead of an oil pumping unit to solve the problems of inaccurate dosing metering and single dosing variety in oil production proposed in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A double-cylinder dosing device at the wellhead of an oil pumping unit comprises two pump cylinders, which are symmetrically arranged on the left and right and are in the shape of a hollow cylinder. A guide sleeve is fixedly connected to the top of the pump cylinder, a lower connecting plate is arranged above the guide sleeve, an opening is arranged on the lower connecting plate at the guide sleeve, a guide column is inside the guide sleeve, the guide column passes through the opening on the lower connecting plate, and the upper part is fixedly connected to the upper connecting plate, a stud block is arranged above the inside of the guide column, the stud block is threadedly connected to the guide column, a stud scale is fixedly connected above the stud block, and the height of the stud block can be adjusted by rotating the stud scale; a plunger is arranged below the inside of the guide column, and the plunger can move up and down in the guide column and the pump cylinder.

[0006] Preferably, a protrusion is provided at the lower part of the guide column to prevent the plunger from separating from the guide column; a check valve is connected to both sides of the two pump cylinders, the upper part of the check valve is the medicine liquid inlet, and the lower part is the medicine liquid outlet, and the upper and lower cavities are provided inside the check valve, which are the inflow cavity and the outflow cavity respectively, and a conical surface is provided on the upper part of the two cavities, which are the first conical surface and the second conical surface, and the first valvular ball and the second valvular ball are placed in the inflow cavity and the outflow cavity respectively.

[0007] Preferably, a polished rod clip is provided at the center of the upper connecting plate for mounting the device on the polished rod.

[0008] Preferably, protective covers are provided on the outer sides of the upper connecting plate, the lower connecting plate and the pump cylinder to protect the interior of the device from contamination.

[0009] Preferably, a buffer spring is provided on the outer side of a portion of the guide column between the upper connecting plate and the lower connecting plate.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention discloses a continuous dosing device, which is installed at the upper end of a packing box. By installing a pump cylinder, a guide column, a buffer spring and other parts on both sides of the device, the upward force of a polished rod is used to suck the drug liquid into the pump cylinder, and the downward force of the polished rod is used to force the drug liquid out of the pump cylinder and discharge it through a check valve 11. The dosing amount can be accurately measured and adjusted by a stud scale to achieve continuous dosing. Two drugs can be added by accurate measurement to prevent wax deposition in oil wells and reduce viscosity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0014] Figure 3 It is a schematic diagram of the cross-sectional structure of the one-flow valve of the present invention;

[0015] Figure 4 It is a schematic diagram of the installation three-dimensional structure of the present invention;

[0016] In the figure: 1, bare rod; 2, bare rod clip; 3, shield; 4, upper connecting plate; 5, stud scale; 6, guide column; 7, buffer spring; 8, lower connecting plate; 9, guide sleeve; 10, pump cylinder; 11, check valve; 12, packing box; 13, stud block; 14, plunger; 15, inflow chamber; 16, first valve ball; 17, first cone surface; 18, outflow chamber; 19, second valve ball; 20, second cone surface. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The present invention provides the following technical implementation scheme:

[0019] See also Figures 1 to 4 A double-cylinder dosing device at the wellhead of an oil pumping unit includes a pump cylinder 10. There are two pump cylinders 10, which are symmetrically arranged on the left and right. They are hollow cylindrical. A guide sleeve 9 is fixedly connected to the top of the pump cylinder 10. A lower connecting plate 8 is arranged above the guide sleeve. The lower connecting plate 8 is provided with an opening at the guide sleeve 9. A guide column 6 is inside the guide sleeve 9. The guide column 6 passes through the opening on the lower connecting plate 8 and is fixedly connected to the upper connecting plate 4 at the upper part. A stud block 13 is arranged above the inside of the guide column 6. The stud block 13 is threadedly connected to the guide column 6. A stud scale 5 is fixedly connected above the stud block. The height of the stud block 13 can be adjusted by rotating the stud scale 5; a plunger 14 is arranged below the inside of the guide column 6, and the plunger 14 can move up and down in the guide column 6 and the pump cylinder 10.

[0020] Furthermore, a protrusion is provided at the lower part of the guide column 6 to prevent the plunger 14 from separating from the guide column; the two sides of the two pump cylinders 10 are respectively connected to the one-way valve 11, the upper part of the one-way valve 11 is the medicine liquid inlet, and the lower part is the medicine liquid outlet, and the one-way valve 11 is provided with two upper and lower cavities, which are the inflow cavity 15 and the outflow cavity 18 respectively. The upper part of the two cavities is respectively provided with a conical surface, which is the first conical surface 17 and the second conical surface 20, and the first valvular ball 16 and the second valvular ball 19 are respectively placed in the inflow cavity 15 and the outflow cavity 18.

[0021] Furthermore, a polished rod clip 2 is provided at the center of the upper connecting plate 4 for mounting the device on the polished rod.

[0022] Furthermore, a protective cover 3 is provided on the outer sides of the upper connecting plate 2, the lower connecting plate 8 and the pump cylinder 10 to protect the interior of the device from contamination.

[0023] Furthermore, a buffer spring 7 is provided on the outer side of the guide column 6 between the upper connecting plate 4 and the lower connecting plate 8 .

[0024] The working principle and use process of the present invention:

[0025] When the present invention is used, the rod clip 2 is connected to the rod 1, and the lower part is connected to the packing box 12 through the lower connecting plate 8. When the oil pumping operation is performed, the rod 1 drives the upper connecting plate 4 to move up and down, driving the guide column 6 and the plunger 14 to move together. When moving upward, negative pressure is generated inside the pump cylinder 10, and the second valve ball 19 in the check valve 11 is sucked onto the second cone surface 20, the liquid medicine outlet is blocked, and the liquid medicine enters the pump cylinder 10. When moving downward, positive pressure is generated inside the pump cylinder 10, and the first valve ball 16 in the check valve 11 is sucked onto the first cone surface 17, the liquid medicine inlet is blocked, and the liquid medicine is discharged from the lower part of the check valve 11. The pump cylinder 10 and the plunger 14 are sealed and matched to form a sealed cavity. The upper connecting plate 4 can drive the plunger to move up and down through the guide column 6 stud block 13. The rotation of the stud block 13 can adjust the distance of the plunger moving up and down, thereby changing the volume of the sealed cavity, so as to achieve the purpose of accurately adjusting the displacement.

[0026] The present invention discloses a continuous dosing device, which is installed at the upper end of a packing box. By installing a pump cylinder, a guide column, a buffer spring and other parts on both sides of the device, the upward force of a polished rod is used to suck the drug liquid into the pump cylinder, and the downward force of the polished rod is used to force the drug liquid out of the pump cylinder and discharge it through a check valve 11. The dosing amount can be accurately measured and adjusted by a stud scale to achieve continuous dosing. Two drugs can be added by accurate measurement to prevent wax deposition in oil wells and reduce viscosity.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0028] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A double-cylinder dosing device for a wellhead of an oil pump, comprising a pump cylinder (10), Features: The pump cylinders (10) are two in number and are symmetrically arranged on the left and right. A guide sleeve (9) is fixedly connected to the top of the pump cylinder (10). A lower connecting plate (8) is arranged above the guide sleeve. The lower connecting plate (8) is provided with an opening at the guide sleeve (9). A guide column (6) is arranged inside the guide sleeve (9). The guide column (6) passes through the opening on the lower connecting plate (8). An upper connecting plate (4) is fixedly connected to the top of the guide column (6). A stud block (13) is arranged above the inside of the guide column (6). The stud block (13) is threadedly connected to the guide column (6). A stud scale (5) is fixedly connected above the stud block. A plunger (14) is arranged below the inside of the guide column (6). Check valves (11) are respectively connected to the two sides of the two pump cylinders (10). A bare rod clip (2) is arranged at the center of the upper connecting plate (4).

2. A double-cylinder dosing device for a wellhead of an oil pump according to claim 1, Features: The one-flow valve (11) is provided with two upper and lower cavities, namely an inflow cavity (15) and an outflow cavity (18). The upper parts of the two cavities are provided with a conical surface, namely a first conical surface (17) and a second conical surface (20). A first valvable ball (16) and a second valvable ball (19) are respectively placed in the inflow cavity (15) and the outflow cavity (18).

3. A double-cylinder dosing device for a wellhead of an oil pump according to claim 1, Features: The guide column (6) is provided with a buffer spring (7) on the outer side of a portion between the upper connecting plate (4) and the lower connecting plate (8).

4. A double-cylinder dosing device for a wellhead of an oil pump according to claim 1, Features: Protective covers (3) are provided on the outer sides of the upper connecting plate (4), the lower connecting plate (8) and the pump cylinder (10).

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